I want to run an electronic that uses 300 watts @ 5-10 amps via solar panel's on my rv.
I've got (2) 6 volt batteries set up in a series so it is 12 volts.
Here are the stats for one battery (so I assume you would 2x it?)
- 20 Amp Hour Capacity: 215
- Delivers 395 minutes of run time at 25 amp draw
- Delivers 105 minutes of run time at 75 amp draw
I have a 200 Watt 12v solar panel that charges the golf cart batteries.
Ignoring the power loss due to inefficiencies in the converter/ system and assuming there is nothing else connected to the system.
How long will I be able to run this per day assuming 10 hours of sun each day?
Best Answer
I’ve not seen a golf cart battery that was only 20AH , the 215 number sounds plausible so you would have 215 Ah at 12v with 2 batteries.
Are you sure you have your numbers correct? My guess would be you have an inverter that outputs 300w at 120, to do this it would draw ~25 amps from the batteries (the draw would be more because of losses in converting 12vdc to 120v ac).
If you want your batteries to last don’t discharge past 50% but golf cart batteries “deep cycle “ can go down to 80% but will only last a couple of years. Using 50% this would provide around 4.3 hours of run time from the batteries alone 25amps or 107.5 ah used , your run time would be extended by adding the solar if in full sun your total run time could be 11.8 hours as you would only be drawing ~9 amps from the batteries but you know your not going to have full sun and this would leave the batteries in a depleted condition or at 50%. If you provide more information on your inverter we may be able to provide better examples.