Coleman Hot Water Service Power Supply, run when battery is dead

[Flex]

The Coleman hot water service is an awesome piece of camping equipment, it allows you to have a shower anywhere when you are out camping.

However the only issue (that I have found) with the unit is the battery. More times that I can remember I've only got one shower out of the unit (as the battery died) or I have forgotten to charge the battery before heading out bush. Plus you can't run the unit when you are charging the battery.

So to solve my problem, I decided to make a power supply for the unit (as the unit runs off 6V) so I could run it off my car's 12V socket. I wanted the power supply to be integrated, as I didn't want switches to flick or extra cables coming out of the unit.

My power supply allows the unit to function like original with the extra bonus when the battery dies you just plug it in and the unit will keep on giving you hot water and charge the battery.

The power supply plugs into the original connectors inside and is attached to the case via stick on mounting posts.

I also incorporated a low voltage (12V side) shut-down so not to flatten your car battery and a detection circuit so you can't run the hot water service while you are charging the battery from the (240VAC) wall charger. (Also the wall charger can't handle the current.)

I was also toying with the idea of making some more of these if anyone is interested.

Below is pictures of the power supply installed into my hot water service:

[AB]

The Coleman hot water service is an awesome piece of camping equipment, it allows you to have a shower anywhere when you are out camping.

However the only issue (that I have found) with the unit is the battery. More times that I can remember I've only got one shower out of the unit (as the battery died) or I have forgotten to charge the battery before heading out bush. Plus you can't run the unit when you are charging the battery.

So to solve my problem, I decided to make a power supply for the unit (as the unit runs of 6V) so I could run it off my car's 12V socket. I wanted the power supply to be integrated, as I didn't want switches to flick or extra cables coming out of the unit.

My power supply allows the unit to function like original with the extra bonus when the battery dies you just plug it in and the unit will keep on giving you hot water and charge the battery.

The power supply plugs into the original connectors inside and is attached to the case via stick on mounting posts.

I also incorporated a low voltage (12V side) shut-down so not to flatten your car battery and a detection circuit so you can't run the hot water service while you are charging the battery from the (240VAC) wall charger. (Also the wall charger can't handle the current.)

I was also toying with the idea of making some more of these if anyone is interested.

Below is pictures of the power supply installed into my hot water service:

I'm interested!

Noticing my battery is not lasting long these days and shutting off whilst charging is very frustrating.

[Cuppa]

Batteries for a hws..... strewth! next you’ll be telling me ya need gas too!.

[Flex]

Crunch the numbers last night and work out if I make a batch of them the minimum order would have to be around 50 to keep the price down. Sell price would be around $80 which would include the circuit board, loom and mounts

[threedogs]

these Coleman showers most pull a heap of amps,
so what is the voltage and how many watts is it???

[the evil twin]

these Coleman showers most pull a heap of amps,
so what is the voltage and how many watts is it???

Nah, they pull bugger all really.
The battery runs the dinky little supply pump and some minor electronics.
They use a 6 Volt battery so it can be portable but recharged from a 12 volt source which is good in some ways but a bit of a PIA in others.

I used to leave mine plugged in to the Camper 12 volts overnight when it isn't being used.
That way it is 100% charged each morning and assuming the 6 volt battery is in reasonable nick should have ample capacity for general camp use and showering.

I don't know how many showers it stops at because it never went flat for teh two of us but most we used it was for 5 a couple of times and was still going.

A 12 volt power supply will mean it will run without disconnecting the charge source and while ever you keep the Gas up to it so very handy for some I reckon.

[threedogs]

Oh so it has a canister to heat the water and a small pump to circulate it.
clever

[the evil twin]

Canister or normal LPG using an adapter and hose but you lose the portability.

I have a filler that connects LPG to the canister and refills the unit as the Coleman Canisters aren't exactly cheap.

[Flex]

The hot water service draws 3A max and 2.6A while running. So around 20W of power.

[AB]

Sounds like my battery is on its way out then.


I would get a third of that usage time ET!!!