Archangel said:
The charger is being revised?
Here is the entire post #143 from mtbkndad, which is why I assumed there might be a revised charger. I'm not trying to start any false rumors.
Shelly
06-07-2006, 08:05 AM
mtbkndad
Flashaholic*
Join Date: Jan 2005
Posts: 942
Re: Amondotech Illuminator 35 Watt HID Searchlight
I have some answers for the different problems that some people have reported regarding the battery charging issues.
1. One person reported the light would not charge at all, ever, with multiple batteries. DEFECTIVE unit. I believe it was replaced.
2. Somebody reported that the light would not stop charging.
3. A few others reported that the light would sometimes stop charging and other times not stop charging until the plug was unplugged and put back into the socket.
The circuit is very simple and has a relay that cuts off electricity when the voltage gets to somewhere arountd 14.6 volts(I say somewhere around because 14.6 is the target but different lights may have slightly different cutoff say from 14.4 up to 14.8). The problem is that charger is a relatvely slow charger that only supplies a little over 15, I believe 15.5 under ideal conditions, volts. Now if the general electrical load of an area is high, the engineer said a circumstance where the charger is not supplying enough voltage to get the battery to 14.6 volts could happen until the load in the area decreases. The net effect would be a slower then normal charging cycle.
I am not an engineer and we were having a three person conversation through (like the party game telephone)
Wayne on two different lines relaying information so I may not get every detail right.
The engineer said the charger that was supplied with the lights will vary slightly in it's output if the current supplying it is subject to fluctuations.
It seems the current the charger supplies is close enough to the target cutoff of the relay to give the appearance that battery is not charging when, in effect it isn't
I know in my area all of the lights in my house get noticeably brighter after around 11:30 PM.
I pointed out that the Costco and Harbor Freight HID have had similar problems reported.
The issue seems to be that nothing is technically defective. Rather there seems to have been a slight design oversight with a charger that supplies voltage so close to the cutoff voltage of the relay even under ideal conditions.
The reason the plug can be unplugged and then replugged back in and have the light turn green is because the charging threshold for starting charging is around 12 volts( I forgot the exact amount). If the light is in a charging cycle and is over 12 volts but is not yet at 14.6 volts it will stay on till the target voltage is reached. If you unplug the chord and plug it back in it will not start charging again if it is over 12 volts, however it is more then likely not at full charge since the target shutoff voltage was never reached.
Wayne asked if a charger could be supplied with the next order that will supply more voltage to the circuit so the relay will always have a battery getting to it's target voltage. The engineer said that should not be a problem. Wayne asked for this to be tested to make sure one fix does not create other problems.
My personal long term solution will be one of the following
A. Keep the screws out of the tail cap, buy an external charger and several spare lead acid batteries since they are cheap, and use the setup like a crude cartridge battery system. (One light 3 batteries = 3 to 4 1/2 hours of run time)
B. Make some NiMH packs and charge them externally.
For the mean time I just charge them overnight since my one "occaional problem" prototype has always behaved when charging overnight.
On another note, just in case I did not mention this before, this order only has about 20 left. Wayne is not putting them on his web site yet because the second order will take some time to get here. The current order will stay $130 total cost (price + shipping). Of course us lucky CA residents pay sales tax too.
Due to increased shipping and related costs from Shanghai to Sunnyvale
then next order will have two different prices.
There will be an ongoing CPF special price of $135 total and the regular web site price of $145 total.
These prices are good for the continental US.
Take Care,
mtbkndad