Does DEKA make a good UPS battery?
I took a trip yesterday down near San Diego, it was twofold. One was to replace my free Trojan T-1275 that was a golf cart reject already when I got it with a pig of a 105# UPS 145ah AGM battery from ...
Forum Discussion
If the megawatt can only push 21 amps maximum into the battery at 14.4v, why do you believe that the alternator can charge it faster at 14.3v?
This make no Sense. How are you determining that the alternator is stuffing the depleted Deka full in two hours? Voltage after stopping the engine? Are you hooking the megawatt to it, cranking it upto 14.4 and seeing it accept only 0.75 amps? Do you have some other method of determining that the AGM is full that the rest of the world is unaware of?
This defies everything I know about battery charging. It seems you have fallen into the "alternator is a magical instant battery charger' mindset that affects 99% of the car driving public.
Also, considering the wiring run to the Deka on the trailer tongue has to have some significant voltage drop, further reducing charge current into a depleted battery
A 175 amp alternator is not magical, nor is pairing distant AGM's, nor is current from the alternator have magical properties compared to that of the megawatt.
Its all fine and dandy to have confidence in an alternator or the engine/vehicle driving it, but it is not going to defy the laws of physics, just because it is rated/ capable of 175 amps, when cold, at higher engine rpm.
If your ammeter on your megawatt is accurate, and your battery can only accept a maximum of 21 amps when set at 14.4v from the megawatt, then your 175 amp alternator is also not going to be able to push more than 21 amps into it, and that is not even factoring in your VW's maximum 14.3v, or the voltage drop to the trailer, which has to be significant.
Something is not adding up here.
Get a clamp on meter and see what the distant Tellycom battery is actually accepting from the alternator over the long wiring path.
This make no Sense. How are you determining that the alternator is stuffing the depleted Deka full in two hours? Voltage after stopping the engine? Are you hooking the megawatt to it, cranking it upto 14.4 and seeing it accept only 0.75 amps? Do you have some other method of determining that the AGM is full that the rest of the world is unaware of?
This defies everything I know about battery charging. It seems you have fallen into the "alternator is a magical instant battery charger' mindset that affects 99% of the car driving public.
Also, considering the wiring run to the Deka on the trailer tongue has to have some significant voltage drop, further reducing charge current into a depleted battery
A 175 amp alternator is not magical, nor is pairing distant AGM's, nor is current from the alternator have magical properties compared to that of the megawatt.
Its all fine and dandy to have confidence in an alternator or the engine/vehicle driving it, but it is not going to defy the laws of physics, just because it is rated/ capable of 175 amps, when cold, at higher engine rpm.
If your ammeter on your megawatt is accurate, and your battery can only accept a maximum of 21 amps when set at 14.4v from the megawatt, then your 175 amp alternator is also not going to be able to push more than 21 amps into it, and that is not even factoring in your VW's maximum 14.3v, or the voltage drop to the trailer, which has to be significant.
Something is not adding up here.
Get a clamp on meter and see what the distant Tellycom battery is actually accepting from the alternator over the long wiring path.
