Running appliances while still charging battery ??
Submitted: Thursday, Jul 03, 2014 at 15:51
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108587
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Member - Brian
Wonder if it is safe in my van to run a compressor type fridge ( 12 v ) connected to 240v but going through a Mobitron box when charging the 12v battery via a charger ??
There is also a solar panel ( aprox 80 w ) via controller
Reply By: Honky - Thursday, Jul 03, 2014 at 22:39
Thursday, Jul 03, 2014 at 22:39
This is how I see it and if it incorrect, please advise.
The appliance gets the power first i.e. if the charger is 20 amps and the appliance uses 10 then only 10 amps goes to the battery.
If the appliance uses 30 amps and the battery charger is 20 amps than the appliance uses the 20 amps from the charger and also takes 10 amps from the battery.
My experience ( and very costly) is the voltage of the charger.
If the appliance range of voltage is say 11 to 13 volts and they charger puts out 14.8 than there is a chance that you may fry the appliance.
A simple view by a simple person.
Honky
AnswerID:
535405
Follow Up By: Shaker - Thursday, Jul 03, 2014 at 22:48
Thursday, Jul 03, 2014 at 22:48
The alternator in your vehicle will output more than 13 volts!
FollowupID:
819276
Follow Up By: Honky - Thursday, Jul 03, 2014 at 22:58
Thursday, Jul 03, 2014 at 22:58
The above volts where only an example.
My situation was that i had set up some 240 volt appliances that ran off an inverter that was not rate for input of over 13.8 volts.
Instead of disconnecting the 240 appliance from the inverter and plugged it into the 240 source, i just charged the batteries and this put in 14.8 volts into the inverter, the result was a lot of heat and smoke.
Honky
FollowupID:
819277
Reply By: The Bantam - Friday, Jul 04, 2014 at 22:45
Friday, Jul 04, 2014 at 22:45
If in this case we are talking about a Mobitronic MPS50A, power supply as used with many waeco fridges, this whole thing may be different to what some may envision.
This particular power supply actually outputs 24 volts ( nominal), if it is a waeco fridge it will run on a wide variety of voltages from its low voltage cut out threshold right up to
well over 24 volts.
If you are realy concerned about the whole arrangement, the MPS50A power supply has the facility to switch from 240V mains supply to the battery supply automaticaly.
Read the manual on this device.
there is a set of terminals to connect the incomming 12 volt ( or whetever supply).
When the unit has 240V supply, the fridge is supplied from the 240v source and the alternate supply is disconnected.
When the 240V supply is lost, the unit switches to the alternate supply.
I have 2 of thses units, but I do not use the switch over feature...I either plug into the 12 volt supply or the 240 volt supply vis the MPS50A as required..as most do.
cheers
AnswerID:
535470