Using shore power with bad batteries
I have two batteries that only show 11v on my multimeter. I have tried to charge them up but can't get them to read above 11 volts. Is it safe to use the RV occasionally plugged into AC power until I ...
Forum Discussion
Design of a converter *assumes* there is going to be a viable battery in circuit. Why?
A battery no only softens the shock of a load that nears (exceeds) the output capacity of the converter...
A battery also acts as a shock absorber.
The transient voltages developed by a large motor that is heavily loaded then gets stopped WITH THE CONTROL SWITCH STILL ON develops horrid transient spikes both negative and positive voltage oriented. It's bad enough when everything is working right, but when...
There is no buffer for adequate transient absorbsion (the battery)
AND
The path on the positive side remains connected and the motor field collapses due to a sudden lack of power because the converter drops off line.
BUT
The switch on the positive side remains closed (the operator wants the jack to continue working)
THE CONVERTER
Sees damaging voltage spikes. Is there enough inherent design protection against voltage foldback?
I doubt it.
This is an attempt at simplifying an answer and it is not adequate. But the essence is very valid.
It isn't that the converter merely overloads but the voltage slumps stopping the overloading of the finals. That isn't the killer. The killer is when the electric motor suddenly stalls and unloads.
A battery no only softens the shock of a load that nears (exceeds) the output capacity of the converter...
A battery also acts as a shock absorber.
The transient voltages developed by a large motor that is heavily loaded then gets stopped WITH THE CONTROL SWITCH STILL ON develops horrid transient spikes both negative and positive voltage oriented. It's bad enough when everything is working right, but when...
There is no buffer for adequate transient absorbsion (the battery)
AND
The path on the positive side remains connected and the motor field collapses due to a sudden lack of power because the converter drops off line.
BUT
The switch on the positive side remains closed (the operator wants the jack to continue working)
THE CONVERTER
Sees damaging voltage spikes. Is there enough inherent design protection against voltage foldback?
I doubt it.
This is an attempt at simplifying an answer and it is not adequate. But the essence is very valid.
It isn't that the converter merely overloads but the voltage slumps stopping the overloading of the finals. That isn't the killer. The killer is when the electric motor suddenly stalls and unloads.
