Originally Posted by Wayne M
I have the REMstarPro M series. It is designed for 12v at 4.18 amps. So any AC plug I plug in has to convert down to 12v and be capable of at least 4.18 amps.
Any concern I would have is maintaining the 12v battery to provide 4.18 amps. How many amp hours would one need from a battery system assuming 4.5 amp draw?
Just an exercise for mathematical portion of the brain.
Something people need to be aware of is dividing your house battery total AMPs by the draw only provides he total number of hours the appliance can run when the lead acid battery (and I believe glass mats too) is maintained at around 77 degrees. The resistance within the battery increases as the battery's temp goes down. At 0 degrees F it will supply about half of its rated value AMPs. I've heard that discharge at lower temps does prolong the cycle count (or recharges), but I personally can't attest to that.
Conversely, batteries being discharged at as little as 15 degrees F over their optimum temperature have their number of cycles cut in half; and, half again for each 15 degrees above that.
Another point to remember, if people want the best value out of deep cells, don't ever let the state of charge drop down below 20%, or 11.7 V. Better yet, don't go below 50%, which is 12.1V, before recharging to get max cycles.