Sizing the wire between the battery and inverter you divide the inverter wattage by the battery voltage (2000w / 12v = 167amps). When I saw that 12 volt based inverter powers 600W appliance, the current was 600W / 12V = 50A, right? Then by the same token, a 2A draw is always 2A * 12V = 24W, right?If you are sizing the wire on the inverter output you divide the load wattage by the output voltage. So if I understand it correct, that means:Īt 20 amp, it discharges for a bit more than 10 hours (215/20)Īt 5 amp, it discharges for 31 hours (157/5)Īt 6 amp, it discharges for 26 hours (156/6) That Sam's Club page did specify that battery as: So your wires need to be sized to handle about 200amps and have fusing that protects it. A 2000w 12 volt system can draw 167amps or more depending on what the load is. You are correct it will consume < 2A but if you use the output voltage that calculates to over 200watts (2A x 115V = 230watts) so add that to your load to determine watt hours consumed.Īnd last data point is the wire size between the inverter and battery system.

If the time is less than 20 hours the Ah rating is higher and misleading.Īs for the inverter. I do connect the inverter to the appliances through a 50ft 16AWG extension cord rated at 13amp, not sure if that added problem here.I am not sure if those Sam's Club batteries are good for solar but when looking for a battery you should have the Ah rating based on 20 hours. That is, if I didn't make mistake somewhere. I do connect the inverter to the appliances through a 50ft 16AWG extension cord rated at 13amp, not sure if that added problem here. In my experience, two such batteries is about capable to power 300watt continuously, but would struggle beyond that wattage. That Renogy 2000w 12V inverter has No Load Current Draw: 7) so can power large appliances, or having only a couple such batteries but only power low watts. That is a true deep cycle battery and, its webpage above says it will last 105 minutes when discharging at 75 amp, is my understanding correct? So I will try to change to the Sam's Club's golf cart batteries mentioned above soon and see what happens. Indeed I later searched on the forum and someone else mentioned another problem with these batteries, ie they won't yield the perceived capacity: Hi SunEagle, thanks so much for your kind help. If I switch to Sam's Club's golf cart batteries, will it better? Does this page say it will last 105 minutes when discharging at 75 amp ?

Is that true? I can't find that specs for this battery. And some people online appear to suggest it's much smaller at high current discharge. I later learned that Everstart battery is rated for 122 AH 1 amp. After that it would return to about 12.5V.

However, when the batteries started at 12.85V, upon producing that 600W, the voltage steadily drops quickly, and in a few minutes it's below 12.2V, and even into 11.8V when I stopped it. I thought that should be able to power 600W equipment for say one hour without problem. They are connected in parallel to Renogy 2000W pure sine wave inverter. I bought two EverStart Maxx Marine Batteries, Group Size 29DC (12 Volts) from Walmart ( ). Hi, I'm new to solar so please tell me if I made any stupid mistakes.

Ever start marine batteries