LittleBill wrote:
i have the renogy (well a variant of it), biggest issue I have is the percent full, its simply based on voltage, not amperage. so if you have it set to 14.4 and your charger is still putting 20+ amps into it, the meter shows 100% full. That's my only issue with it.
This is where the Victron units excel. 100% SOC is reset based on 'Tail Current', not voltage.
Victron also incorporates the Peukert Factor into their calculations which is extremely important if monitoring Lead Acid batteries with loads that vary from just a few amps (lights) to heavier loads of the furnace, etc. Then there are the extreme loads becoming more prevalent today in RV's like 12volt refrigerators or residential refrigerators running off an Inverter or even a Microwave causing a draw from batteries in the range of 100-150 amp.
Unless the monitor takes into effect the varying loads (or varying charging currents) any SOC indication is at best a wild guess.
Only exception to the Peukert effect with varying high/low current draw is a LiFePo4 battery which has essentially a Peukert Factor of "1.0".
Peukert's Law
