Questions tagged [solar-charge-controller]

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Can I charge lead-acid batteries with more current than their rating?

I have a solar charge controller with these specs: Type: PWM-Type Solar Charge Controller, 30A, 12V/24V Battery type: DC 12V/24V (auto-detect) Charge current: 30A Discharge current: 30A USB output: ...
1 vote
2 answers
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Charging my 18 V mowing robot

I have a mowing robot, Bosch Indego 500 S. It says it has an 18 V lithium battery. I would like to charge it with a battery. I can only find 12 V or 24 V batteries in the stores. Is the 12 V still OK? ...
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Is there an MPPT charger to charge a 540 V battery with a 200-300 V PV panel?

I am planning to design an EV boat. I have a PV panel of about 200-300 V and a 540 V LiFePo4 battery. My question is: How can I charge my battery with the PV panel if there is no MPPT that can boost ...
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1 answer
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Testing solar charger board with a bench power supply

I have a solar charger wired up to charge a battery that powers an inverter, all on one board. I want to test the board before connecting it to the solar array that I have. I bought a bench supply ...
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1 answer
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Design of a high voltage system for solar car using MPPT with batteries and motor controller

We are planning to make a system that can run a BLDC motor and charge a battery with a PV array using a boost MPPT. Current aiming spec on output side: Nominal voltage 96V. I am nt sure if there are ...
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2 answers
83 views

How can I keep the output voltage of my MPPT buck converter in my PV system constant while connected to the load (battery)? [closed]

I've designed a PV based solar charger controller using the MPPT algorithm to charge my 12 V tubular battery for a DC load. I need to keep the output voltage constant at 14.5 V to connect a 12 V ...
2 votes
2 answers
176 views

Very simple solar lithium charger (18650)

I need a very simple charger for 18650 LiPos (2.6Ah.) Since the solarcell (6V/150mA) will not be over the CC of the battery, I think only a precise 4.2V CV limiter will be sufficient. Has anybody ...
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1 answer
54 views

Solar - charge batteries at 24 VDC, use 12 VDC loads

I have solar panels to charge controller to batteries to DC loads. The charge controllers can handle twice the power at 24 VDC as they can at 12 VDC. The loads are 12 VDC (mainly LED lights). Can I ...
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CN3065 - if VIN > 4.2V - stops charging?

I'm a noob working on a small project where I have the following setup: Small Solar Panel (1 W) <---> CN3065-based battery charger <---> 2 Ah Li-ion cell. The voltage of the solar panel ...
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1 answer
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Need help understanding the behavior of solar charger and Inverter

I want to understand what happens when a solar charger is charging the battery while the inverter is also drawing a load from the battery. Say theoretically the charge controller supplies 10A and the ...
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2 answers
31 views

Solar inverter/charger to battery connection protection

I have a solar off grid inverter/MPPT charger and I want to install protection on the link between the unit and the battery. I thought of using a Circuit Breaker like this. But the problem is that DC ...
2 votes
1 answer
34 views

How can a solar battery charger without separate load connection include three stage charging?

As you may know, there are several solar battery chargers (e.g. mppt Victronenergy ones) that only provide 2 connections, one to the battery and one to the solar panels. So, no separate load ...
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Can we use MOSFETs instead of diodes as backflow preventer?

I have 400W solar panel connected to a 12V 60A MPPT charge controller charging a 12V 110Ah battery (Phoneix TX-1000.) I'm running a 12V DC load (300W) directly from the battery. In the evening when ...
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34 views

Why is my solar charge controller reducing current?

I have a 60 W, 20 V solar panel and I am trying to charge a 12 V, 70 Ah lead-acid battery with a solar charge controller. I set the charging voltage to 14.1 V in the controller but it shows the ...
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2 answers
53 views

Portable Power Station Solar Input Limitations - Workaround?

I'm considering buying this unit for backup energy + solar charging: https://www.ecoflow.com/us/delta-pro-portable-power-station Now, the max input is 1600W with 150V and 15A max. This is acceptable ...
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1 answer
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How to run a small water pump using a solar panel?

I have a solar panel: Output power 10 watts Operating voltage 12 volt I want to run a small water pump maybe 3W small submersible pump. How can I connect the pump with the solar panel? Someone said ...
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58 views

12V boat lead acid battery suddenly failed

Battery on boat and powered by solar panels started acting really weird suddenly exactly a week ago. App shows voltage went from minimum 12.3V to min 6V in a day. On board voltmeter showing 11.9-12.2 ...
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2 answers
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5V protection circuits

For my project, I'm using this solar shield in order to use some solar panels and a battery to power my Arduino. In order to protect the solar shield (where the maximum solar input is 6V) I would ...
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2 answers
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Determine voltage and current for given I-V curve

Excuse me for my noob question, I'm new with solar panels. I'm trying to understand what value of current\voltage a charge controller gets in a given moment. Lets say that on given temperature and ...
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49 views

LiFePo4 Battery management system

I am creating a 2Ah 3 cell LiFePo4 battery using individual lifepo4 batteries, for a project that requires solar charging from a genasun mppt controller. Considering the battery is split into 3 cells, ...
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Connecting LiFePo4 in series?

I am looking for 3 LifePo4 batteries for a project, since they are quite stable when compared to Li-po/Li-ion. I have found this battery that fulfils the max amp draw requirements. I need three in ...
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1 answer
87 views

Matching Solar Panel to TP4056 Charge Controller

I would like to match solar panel (6 V\1000 mA) to charge controller based TP4056 in order to charge 18650 battery around 3200 ...
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73 views

Switching between two circuits with DPDT with minimal current consuming

I am trying to design a system that will be powered by solar panel and 3.7v lithium batteries only. Im not electrical engineer, ...
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4 answers
237 views

Can I use a PWM solar controller for charging a 24V battery from a 50V solar panel

I have a 460W solar panel with 50 Voc (open-circuit voltage), and a 24V battery bank. I'm thinking of using a PWM (60A) controller to charge this battery bank. My understanding with PWM is that it ...
0 votes
1 answer
317 views

Charging batteries with both an inverter and solar panels

I have an inverter, a battery bank, a PWM solar controller, and some solar panels. The inverter also supports charging the batteries from the mains power. So if I just plug the inverter into a wall ...
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1 answer
52 views

CN3722 External MOSFET heating up

In my charging circuit, CN3722 is used as the charging controller where I'm using an external MOSFET FDS4435bz as per it's application. Earlier I was using DMG2307L-7 which was heating up(50°C). To ...
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104 views

MPPT charge control voltage drop

What would explain a voltage drop on the load side of a MPPT solar charge controller? My power source is not actually a solar panel, but a 12v 300watt DC power supply. At present there is no battery ...
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Charging a supercapacitor bank from PV

Have a small 5w PV panel with maximum power output around 16.77v@0.32a, and a no load voltage of around 20v. I'm getting an appropriately 100F 16v supercapacitor array with integrated balancing board. ...
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Plugging an MPPT controller into another MPPT controller

I am installing a CTEK D250SE charger into my camper trailer. The D250SE contains an MPPT controller for charging from a regular solar panel. The catch is that my existing solar panels already have an ...
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61 views

Using an existing MPPT charge controller and solar panels with new battery pack

I have an off-grid setup at the moment to power most of my DC devices (bulb, router, NAS, NVR, etc.) I'm planning to upgrade my setup to a more powerful AC off-grid system to power my entire house. My ...
1 vote
1 answer
87 views

Keeping sealed lead acid battery bank in good condition - and science behind

I will have 2 lesuire batteries on the boat. The bank will be 12 V and 150 or 220 Ah (not sure yet). I am trying to find out if constantly delivering low current (say 0.1) before charged and later ...
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1 answer
50 views

Can I use 10A solar controller with one 445 watt panel

I am wondering if I can use 10A PWM controller with 445 watt or 625 watt solar panel.
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1 vote
2 answers
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Can I estimate irradiance from photovoltaic panels' output data?

I'm trying to figure out a way to estimate irradiance from the data I get out of photovoltaics panels; irradiance, or any other variable that would be appropriate to my use case/context, which I hope ...
2 votes
3 answers
634 views

Why doesn't the voltmeter show the charging voltage when connected to a solar controller's battery connection?

My understanding is, for charging to occur, a solar charge controller needs to output at a higher voltage than the battery's voltage. If so, why, when you test the battery connection of a solar charge ...
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144 views

Can a PWM solar charger use a battery as the source?

For background, I am slowly migrating from 12v to 24v, but want to use my existing 12v inverters if possible, by having a 12v battery kept topped-up by the 24v batteries. I have a decent MPPT ...
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1 answer
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Connecting an Arduino to both panel and load side of charge controller, can this work?

I just joined this site because my searches haven't turned up an answer to this question, so apologies in advance if I missed something. I have an Arduino powered by the load side of a 12V solar ...
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1 answer
49 views

Solar charging portable 3S2P Li-Ion battery powered equipment

We have experiment and lighting equipment for outdoor use, using 3S2P Li-Ion battery packs quite similar to these (12,6V max. charge; 11,1V nominal; 9,4V cut-off) that we want to charge from solar ...
1 vote
0 answers
48 views

Adding 12V power supply to existing Solar MPPT load circuit

I have a camper which has a small 12v power system consisting of a 50w solar panel, a generic 20ah LiFeP04 battery, an a 15A Victron MPPT controller whose 12v load output feeds directly to a fuse ...
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1 answer
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Reduce voltage, maintain current

I’ll be frank, I messed up. I’m installing a solar system in my camper van and bought a combined solar MPPT charge controller and DC/DC charger. Unfortunately I didn’t notice the max solar input for ...
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1 answer
162 views

CN3722 solar controller - What MOSFET should I use?

I need to know what P-channel MOSFET to use with a CN3722 to charge two 18650 batteries. The datasheet doesn't say what MOSFET to use. My solar panel parameter are: maximum power 10w maximum ...
1 vote
2 answers
193 views

CN3722 solar controller does not stop charging

I have this custom PCB witha CN3722 module. I charge two 18650 batteries. Resistors XVR7 and XVR6 are calculated for 8.3 volts. The charger charges the batteries and the "done" LED turns on ...
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36 views

Solar Battery Charging Circuit

I designed this circuit: to charge my 12 V UPS battery from a 40 W, 18 V solar panel. I specifically included an LM317T adjustable voltage regulator to control the output voltage to about 13.4 V as ...
-1 votes
1 answer
106 views

12V DC to DC converter used in place of solar charge controller [closed]

I bought this product to use as solar charge controller. My circuit consists of: 12V solar panel (5A?) -> 12V (DC->DC) voltage converter -> 12V 35Ah SLA battery The converter says its input ...
0 votes
1 answer
77 views

SPV1050 Harvester IC MPPT Setup

I have been trying to use SPV1050 Harvester IC with a solar panel to charge a Li-Ion battery. However I am having problem deciding the resistor values for the MPPT pins. In section 6.4-MPPT Setting of ...
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1 answer
87 views

Running load directly off solar panels (bypassing charge controller) - Silicone heater

I am working on a solar setup that is powered by a Li-ion batteries. However, Li-Ion batteries can't be charged below 0 deg C, and thus if it dies in the winter, it will need to be warm before it can ...
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1 answer
173 views

How a 10w solar panel charge a 12v battery through a solar charge controller?

I am newbie in electrical engineering. Recently, I ordered a solar DIY kit package which includes a solar panel(10W, 12V, 1A), a solar charge controller and an inverter(DC 12V to AC 240V). I plan to ...
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Is it ok to charge a 12v battery with an AC to DC adapter and an solar charge controller?

I don't have solar panel. I want to charge a 12v battery from the power supply on the wall. My plan is connecting an adapter (AC 240v to DC 12v) and a solar charge controller to charge the battery. Is ...
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2 answers
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I have made a 50W solar mppt charge controller, but don't have a solar panel. What can I use to replicate this without a solar panel

It's a 50w solar charge controller. I'm using an Arduino-based system with the ACS712 current sensor. What other inputs could I use to replicate the functioning of a solar panel to test the ...
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1 answer
49 views

Camper battery charge

in a Camper we usually have many different way to charge the battery (in my case LiFePO4): Solar Plug Engine It may happen that 2 or more are charging at the same time (for example the Engine and ...
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Charging a 12vdc lead-acid battery bank with two different power sources (solar & wind)

Looking to upgrade an existing solar system with two (2) 285W panels going through a 40A MPPT solar charger. The solar charger is charging 4 6v lead-acid deep cycle batteries. ((Cell 1 + Cell 2) || (...

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