Question on charging batteries with Gen
We will be picking up our new to us toy hauler next week. It has a 23 CF residential refrigerator and an 80 amp converter. For the 1-2 times a year that I do not have shore power, Would my 2200 genera...
Forum Discussion
With the battery starting at 12.2 and your charger is set for say 14.6v, first you get 80 amps Bulk and battery voltage jumps to say 13.6v. Then battery voltage slowly rises while amps stay at 80 amps until you see perhaps 14.2v battery--BUT that voltage is with voltage drop due to the 80 amps.
Close to then you see amps start to taper. With that tapering you get less voltage drop and gradually as Absorption continues, battery voltage gets closer to 14.6. It does not reach charger voltage of 14.6 until amps have stopped flowing so both read 14.6 and the battery is full.
Since input watts is highest required when output watts is highest, that is just before amps taper when battery voltage is 14.x at 80 amps.
Output watts is battery voltage x amps, but I am unclear which voltage to use --the one as seen with the voltage drop to it as measured at the battery, or the "real" voltage 14.6 as set on the charger.
Say you use the one as seen at the battery. So output watts is 80 x 14.2 = 1136w. Charger efficiency 85% typical, so input watts is 1336w
PF is 0.7 so demand on the generator is 1909VA. That is over the 1800w running spec for the Ryobi 2200 gen.
OP should use his big gen for recharging at 80 amps until amps start to taper at the start of the Absorption stage. Then he can switch to the 2200 for that long run at tapering amps.
Close to then you see amps start to taper. With that tapering you get less voltage drop and gradually as Absorption continues, battery voltage gets closer to 14.6. It does not reach charger voltage of 14.6 until amps have stopped flowing so both read 14.6 and the battery is full.
Since input watts is highest required when output watts is highest, that is just before amps taper when battery voltage is 14.x at 80 amps.
Output watts is battery voltage x amps, but I am unclear which voltage to use --the one as seen with the voltage drop to it as measured at the battery, or the "real" voltage 14.6 as set on the charger.
Say you use the one as seen at the battery. So output watts is 80 x 14.2 = 1136w. Charger efficiency 85% typical, so input watts is 1336w
PF is 0.7 so demand on the generator is 1909VA. That is over the 1800w running spec for the Ryobi 2200 gen.
OP should use his big gen for recharging at 80 amps until amps start to taper at the start of the Absorption stage. Then he can switch to the 2200 for that long run at tapering amps.
