Questions tagged [solar-charge-controller]
The solar-charge-controller tag has no usage guidance.
265
questions
2
votes
1
answer
90
views
Why does the MOSFET drain potential show this strong turn-off overshoot? How to fix it?
I am trying to build a PV charger (PWM), which I guess is kind of a buck converter. Below is a first LTSpice simulation. V1 are the PV modules, V3 is the battery. V2 is the microcontroller's supply ...
- 641
2
votes
1
answer
63
views
What happens when a CC/CV charger fails to give the required output voltage during CV charging and instead provides a lower constant voltage?
Lets say that I have a CC/CV charger based on buck topology and it is charging a 12V lead-acid battery through a solar panel. The lead acid-battery is being charged in CV (Constant Voltage) mode and ...
- 125
2
votes
2
answers
67
views
How can I warm lithium-ion batteries from a solar panel?
I have a solar-powered system with a 12 V LiFePO4 battery which will need to operate in -20 to 60 °C conditions. I have a charge controller with a temperature sensor which will disable charging below ...
- 249
2
votes
2
answers
78
views
How does applying an MPPT algorithm on a buck converter result in maximum current into the battery?
When an MPPT solar charge controller —in my case, based on buck topology— is charging a battery in constant current(CC) mode, the MPPT algorithm is applied to find the PV panel voltage (or input ...
- 125
1
vote
2
answers
50
views
Is it possible to pair MPPT/PWM charger with a computer UPS? Would it prolong the UPS battery's lifespan?
I've an old UPS for my computer which draws 50 W on average and less than 150 W at full load. With the the built-in battery I only have about 10 minutes of backup time.
I am thinking about getting a ...
- 11
0
votes
1
answer
77
views
Can someone explain these battery charge discharge charts?
I have these charts from Renogy 12V Deep Cycle AGM Battery 100AH datasheet.
Can somebody explain to me In the first chart: what does the F.V/Time column present?
In the second graph: What does each ...
- 3
3
votes
6
answers
583
views
How is the output of an MPPT solar charge controller connected to a battery?
I have some confusion about how the output of an MPPT solar charge controller should behave. In my head, I'm thinking of a perturb and observe system where the output should oscillate around the ...
1
vote
1
answer
83
views
Why is the load connected to the batteries instead of the load output of the controller?
I bought a small photovoltaic kit to do some experiments.
It is composed of:
PV panels
charge controller
batteries
inverter
In the controller's manual there is this connection diagram:
It makes ...
- 1,141
3
votes
2
answers
142
views
How can I reduce solar panel voltage of 49-51V to below 48V?
My MPPT's maximum input voltage is 49.5V.
The solar panel's specs are:
Open circuit voltage (Voc) = 49.40V (plus or minus 3%)
Maximum power voltage (Vmp) = 40.42V
Maximum power current (Imp) = 10.02A
...
- 51
3
votes
2
answers
132
views
Simple low-current voltage limiter in a solar battery charging circuit
I am trying to devise the simplest/cheapest possible circuit for using a small solar cell to maintain the charge on a single-cell lithium battery. The reason for low cost is that I need to build ...
- 183
2
votes
4
answers
187
views
How does a buck converter maximize the power in the MPPT system?
How can a DC-DC buck converter be used to maximize input power in an MPPT system? I know that an MPPT system consists of a processor that reads the power source and manages a buck converter to ...
- 59
0
votes
1
answer
45
views
Charge 12 V battery bank from a 24 V MPPT solar charge controller
I am planning on boondocking on my RV and am in the phase of designing the system and want to stay at 12 V. I have found the perfect solar panels for it, but the specs make them somewhat odd to wire:
...
0
votes
2
answers
112
views
Do I need a buck or boost converter to charge a lithuim battery with solar and wind energy?
I am doing a school project in Matlab Simulink to design a battery charger.
I need to use solar and wind energy to charge the batteries. Since both solar and wind are not always constant voltage and ...
- 1
9
votes
6
answers
734
views
How do/can I charge a Li-po battery without a fancy charger (just using a current)?
I am designing a model airplane that flies using solar cells on its wings. I have a 7.4 V, 2200 mAh battery I want to use for it in case it flies in a cloudy area and needs more power, but everywhere ...
0
votes
1
answer
100
views
What size DC circuit breaker to buy for a 12 V, 80 W solar panel?
I have bought a 12 V, 80 W solar panel and before I start using it I want to install circuit breakers between the solar panel and the charge controller, the charge controller and the battery, and the ...
- 101
0
votes
0
answers
33
views
Safe DHW with PV
as the title says, i'm trying to heat water for domestic use via PV. From my research so far, the most popular suggestion seems to be solar thermal. That isn't the right option for me.
Pros of solar ...
1
vote
1
answer
125
views
What is the main purpose of this yellow part after the fuse?
My friend brought a board to me for repair. This board is a solar tracking board. It is powered by a 24 V PV panel. It is supposed to charge a battery. If there is no sun, the battery will supply ...
- 1,031
0
votes
0
answers
44
views
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
73
views
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? ...
- 23
0
votes
0
answers
53
views
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 ...
- 11
2
votes
1
answer
118
views
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 ...
- 709
0
votes
1
answer
76
views
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 ...
- 57
0
votes
2
answers
298
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
199
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 ...
- 29
0
votes
1
answer
56
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 ...
- 3
0
votes
0
answers
62
views
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 ...
- 3
0
votes
1
answer
32
views
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 ...
- 247
0
votes
2
answers
39
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 ...
- 1
2
votes
1
answer
45
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 ...
- 125
0
votes
2
answers
294
views
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 ...
- 15
0
votes
0
answers
38
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 ...
0
votes
2
answers
134
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 ...
- 101
2
votes
1
answer
450
views
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 ...
0
votes
0
answers
62
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 ...
-1
votes
2
answers
76
views
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 ...
- 107
0
votes
2
answers
236
views
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 ...
- 213
0
votes
0
answers
67
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, ...
- 23
0
votes
0
answers
44
views
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 ...
- 23
0
votes
1
answer
191
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 ...
- 213
0
votes
0
answers
81
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, ...
- 213
0
votes
4
answers
456
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 ...
- 71
0
votes
2
answers
2k
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 ...
- 71
0
votes
1
answer
63
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 ...
0
votes
0
answers
188
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 ...
- 197
0
votes
0
answers
44
views
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 ...
- 723
0
votes
0
answers
73
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 ...
- 103
1
vote
1
answer
102
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 ...
- 111
2
votes
1
answer
54
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.
- 121
1
vote
2
answers
66
views
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
795
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 ...
- 23