Questions tagged [solar-charge-controller]

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19 views

Recharging of Inverter Batteries

Is it possible for some reason I can be able to safely connect two charge controllers (who draw their solar power from the same solar panel array) to charge separate/independent batteries? (It is to ...
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0answers
28 views

Is it safe to have two batteries in series on a solar panel system with 14.22v and 14.46v?

I have two batteries in series plugged to a solar panel system. In parallel they used to balance each other perfectly. But now i'm trying to have a 24v system and I have them in series. They ...
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1answer
36 views

How is power generation computed in a circuit?

I have made a simple circuit of by attaching a 10 ohm resistor in series with an LED and then attaching it to the solar panel. I use an AVR Microcontroller to measure voltage across the resistor ...
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1answer
38 views

What is the maximum voltage for MPPT/PWM to charge a X volt battery?

I currently have a PWM 12/24v (auto commute) with ~18V as input and a 12V battery in the output. I wanted to switch to 24V battery and I thought about going ~36v solar panel. (18V * 2) Then I saw ...
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1answer
57 views

How can I switch solar panels on and off with a microcontroller?

I have built a li-ion 18650 7S pack as my solar backup. It is being charged by 3*250W solar panels in series (about 105V 8A.) My charger doesn't have an option to monitor individual cell voltages. ...
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1answer
44 views

Charging a big battery with small solar panels very very slowly

I have a 6V, .7amp solar panel that typically puts out 2-5V under normal conditions. I would like to charge a 12V 5 amp hr lead acid battery over a few days to weeks. The device that I want to ...
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1answer
33 views
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0answers
28 views

Fitting a BQ24650 based MPPT charge controller to a permanent magnet generator wind turbine

I am investigating MPPT charge controllers modules for wind turbines. I came to the conclusion that my MPPT controller design investigations are more fitted to wind turbine MPPT than solar. I need ...
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1answer
42 views

External diodes for Solar panels in parallel

I have two solar panels, same brand same model and same voltage and current characteristics. I wish to connect them in parallel. Must I use an external diode? I have checked, they have two diodes ...
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4answers
111 views

Solar charge controller with input from a laptop charger efficiency

Instead of connecting a solar panel to my 12v 30a PWM solar charge controller, I want to connect a laptop charger to make a DIY UPS. Will the solar charge controller constantly draw the maximum ...
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1answer
35 views

what is the equivalent circuit for battery in charging process?

OK I know a little bit about battery discharging process that is, I know that the open circuit voltage of battery decreases as SOC goes down, and the voltage is less than the Voc when connected to a ...
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1answer
50 views

Power limiter for 1 kW hydro turbine

I have a question about designing a solar-hydro energy system, as we ran into a problem in the implementation phase. We have 1 kW pv plant connected directly to a charge controller, and the 1 kW hydro ...
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2answers
115 views

RS-485 to USB converters (cable conversion)

I am working on a project that involves a Solar Charge Controller. The device ships with an Ethernet RS-485 communication interface as well as a RS-485 to USB cable, which is said to be able to ...
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1answer
27 views

Simple Solar Circuit

I had a very cheap solar panel + controller where the controller died. To cheaply replace it I was going to build my own using some parts I had laying around and use a step-down (LM2596) to limit ...
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1answer
35 views

Solar LiPo battery charger: revision and improvement of the reverse voltage protection circuit for the battery

I am designing a solar charger with MPPT for a 1-cell lithium polymer battery of approximately 6000 mAh. The solar panel is 10W and 21 Voc. I am trying to ensure that the charger has protection ...
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3answers
99 views

Solar power backed circuit to light 1W LED

What I have achieved so far: Referring https://www.instructables.com/id/BUILD-A-NOCTURNAL-SOLAR-LIGHT-BULB/ , I have successfully built the solar garden light circuit to light a 5mm LED using ...
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1answer
60 views

Charging 4 x 12V lead acid battery with solar in series or parallel?

I have a small electric vehicle that currently uses 4 x 12V 8Ah SLA batteries wired in series as its 48V battery packs. I have 2 of these packs. In order to charge the batteries, I unplug all of them,...
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1answer
67 views

Can I use an h-bridge as a changeover circuit?

I have solar controller which outputs battery voltage when available. I also have a switching psu as backup. What I would like to do: Use an h-bridge, connecting its battery negative terminal to my ...
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1answer
60 views

PV with Arduino and 12Volt Sealed Lead Acid battery

I have bought this solar charger (Epsolar-LS0512E): https://www.manualslib.com/manual/970886/Epsolar-Ls0512.html#manual a 12 Volt Sealed Lead Acid battery, and I use this solar panel: Voltage: 12V ...
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0answers
33 views

Draw power evenly from two 12v battery banks, 24v solar system

I am currently running a small 24v emergency power solar system. I have a 40a MPPT charge controller with (4) 12v flooded lead-acid batteries in a 2S-2P configuration. I have a need for both 24v and ...
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2answers
176 views

How does a solar PV inverter throttle the input power

I have a solar power system (SMA Sunny Boy with 2 strings of panels). When the battery is nearing full charge or the inverter maximum output is reached and excess solar power is available the system ...
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0answers
70 views

MPPT controller with battery management system

I'm trying to create a little solar charger with backup battery for my Arduino. I would like to use a MPPT controller for the solar panels. I found a few solutions like the IC CN3722, but all of these ...
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5answers
4k views

Why are off grid solar setups only 12, 24, 48 VDC?

I am looking to produce 50kW for an off grid solar project. Ideally, I'd like to have a high voltage DC battery system with a high power battery inverter and charge controller. I have only found a ...
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1answer
82 views

Connecting Grid Tie Inverter to Solar charge controller

I've got simple solar panel - PWM charge controller with 10A max load output - 12V battery setup. I've ordered MPTT 600WATT grid tie inverter. My question is - if I connect higher load than 10A to ...
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5answers
101 views

How Can I connect My Solar Power System? [closed]

I brought this 50A Solar Controller now I want to connect an inverter to it and they said to connect the inverter directly to the battery. I also brought a 100W Solar Panel and MC4 Wires, etc What ...
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1answer
476 views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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1answer
70 views

12V - How to activate an electric item if battery is full

I have a solar system 12V connected to a PWM controller 20A and a lead-acid battery 80Ah deep cycle. What kind of setup should I make to activate a pump (12V) if the battery is full ( >13.8V ) ?
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1answer
199 views

Is is safe to let my PWM charge my 12V battery at 14.8V?

I have a 12V battery linked to my solar panels. In the middle I have a PWM charge controller, that is configured by default to charge the battery if Voltage if lower than 14.8. At night, battery ...
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1answer
233 views

CN3722 charging issue

I'm using CN3722 for 2 cell battery charging. I have two way supply, it gets power from Solar as well as DC 12V whichever is available. The MPPT is set at 11V. Solar panel maximum goes to 21V. I ...
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0answers
49 views

Current and voltage increasing with duty cycle from buck- converter

I am designing a 2s Li-ion battery charger using a buck converter from a 10W (18V, 0.55A) solar panel. So I understand that the duty cycle controls the ratio of the input power vs output power and ...
1
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2answers
170 views

LM741: voltage comparator Issue

I'm working on an automatic battery charging source switching between solar power and a 24Vdc wall adapter.I'm using a LM741 as voltage comparator and a relay for power switching. Basically, if solar ...
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2answers
163 views

Using a 12V battery while simultaneously charging via Heavy Duty battey charger

Very similar to a question asked and answered but using solar panels.. BUT this time I'm asking, Can I use my 135Ah deep cycle battery to power a 2000W inverter and at the same time charge my battery ...
0
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1answer
49 views

PV voltage on solar charge controller always 13V [closed]

I just wired a solar panel with solar charge controller (SCC) and battery. The photovoltaic (PV) voltage displayed on the SCC is 13V, even though the PV voltage without load that I measured with a ...
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1answer
60 views

Solar inverter stops drawing power from PV

I have 3.2 kVA solar inverter with MPPT charge controller along with six 340 W solar panels installed. What I have noticed is that the inverter stops drawing power from PV though there is bright sun ...
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1answer
126 views

TP4056 doesn't work without power source connected [closed]

I have a problem with my TP4056 circuit. My goal is to (solar)power a NodeMCU V3 with the TP4056. I simply connected the output from the TP4056 to VIN and GND from the NodeMCU board The TP4056 ...
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1answer
129 views

Solar charge set up damaging battery?

I've installed a 12V 80W solar panel plus controller and attached it to a 12V 105Ah leisure battery. At first it (appeared to?) work. The charge status on the solar charge controller was at max and it ...
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1answer
44 views

How should a load be connected in a configuration of a MPPT solar charger and a LiPo battery?

I am designing a circuit for MPPT solar charger SPV1040 which could charge a single-cell LiPo battery. I am using AN3319 and AN4050 application notes for reference. I also want to connect a load ...
1
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1answer
331 views

Measuring current from solar panel using an arduino?

I am designing a MPPT buck converter and bought ACS712 30A arduino current sensor and it is awful. Not accurate at all. so I find two configurations circuits that might help find an alternative to ...
3
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1answer
160 views

Different Wattage Solar Panels for Home [different Voltage/Ampere]

My current solar system for home 12V 100W polycrystalline Solar Panel. 12V 75Ah Lead Acid solar tubular Battery. PWM 12V 10A Solar Charge Controller. 12V Input and 200VA Output Inverter. Current ...
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1answer
46 views

EV Car's battery voltage and charging with solar panel

How much is the voltage of electric car's batteries? I was thinking about a DIY electric van (Mercedes Sprinter) with 3x200 watts solar panels on the roof. I'm not sure but let's say the EV batteries ...
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0answers
30 views

battery charge controller with small panel

i am designing a battery charge controller with a small panel of 4.5V and 250mA in Arduino UNO. I want that the panel charges the battery(1.2V 3000mAh AA NiMH). i wonder where i place the panel in ...
0
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1answer
76 views

Can I charge this li-ion battery with this solar panel setup? [closed]

Since a couple years I've been messing around with a raspi and some motors. Building random stuff with dc-motors and such. I now want to power a self driving boat-robot with some solar power. For this ...
3
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4answers
356 views

Best practice: Should I charge a battery while also pulling load?

I have an off-grid solar panel setup. The solar panels send current to an MPPT charge controller. The charge controller controls current to a lead acid battery. On these same battery terminals I have ...
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2answers
371 views

Can I use a MPPT Solar Controller to charge my auxillary 12V AGM Battery from the car battery/alternator?

I have a RedArc solenoid and a Victron 75/15 Smart Solar Controller. Can I use the combination of these two units to charge an 12V AGM Deep Cycle auxiliary battery from the car battery/alternator ...
1
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1answer
176 views

Is MPPT of PV array possible if only converters are used and the connected load is a battery?

I am currently working on a project to harvest energy from solar PV panels. There are some difficulties that i am facing. I was able to achieve mppt using a constant resistive load with a converter. ...
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2answers
115 views

Possibilities for 24v Solar charging of 12v batteries in series and parallel with different Ah capacities

I have two 12 volt 200Ah lead acid batteries and two 12 volt 150 Ah lead-acid batteries. I have a 24 volt 50 Amp charge controller connected to a 150 watt PV panel (overkill for now, but ready for ...
3
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1answer
262 views

Minimum current for charging a battery

Recently I bought a 12V 200Ah battery for my solar system with 500W 18v (27A) solar panels. I find a label on the battery which is notice that the minimum charging current is 10% of the battery ...
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1answer
47 views

How to measure available amps? Do i need more load?

My new 200W 18v 11a(max) solar panel reads about 24v 4a 50% efficiency at midday on my MTTP Rich solar controller. I presume this is not great. I was wondering... I have a 48v to 12v stepdown ...
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2answers
72 views

Van with Solar power but no auxillary battery and only on sunny days. Do I need switches and isolators?

I have a 2018 Ram Promaster city cargo van with OEM 12v 70AH 120RC Sealed Led acid battery and a 160a alternator. Sitting on top of the battery I have a 1200 Watt pure sine 110v inverter connected ...
1
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1answer
68 views

Heating issues with solar charging circuit

I am using the above circuit to charge a 7.4V Li-ion Battery.With input MPPT voltage set at 12V, I have applied 13V input voltage to the circuit. The battery is charging at 1.4A. (according to the ...