It's still not apples to apples. In bass boats, everybody is switching to the lithium batteries because of the additional power you get to your electronics. A 50aH lithium will run the electronics in a boat (fish finders, trolling motor, motor starter etc) for the same amount of time as a 100aH lead acid and has been proven again and again over on that side. You're still comparing apples to oranges when comparing simply aH ratings on lithium and lead acid.
Maybe Ah in boat batteries are measured differently (e.g., at slower than C1 rate), or boat electronics don't tolerate any voltage dip. I don't see this necessarily directly translating to aviation, where batteries are tested to comparable cutoff voltages at C1 and electronics generally tolerate voltage dips.
Amp hours are amp hours. Boat electronics don't tolerate voltage dips well (most shut off at 11 or so volts) so that is a good point. What voltage will a Garmin GPS stay on until or an electric gyro stay running at the proper speed for accuracy?
I ammended my above comment after you quoted it, but this is not the case. Batteries can be measured at different discharge rates. Lead acid batteries are well-known to have lower Ah capacities at higher discharge rates. In the less-regulated marine space, it seems very likely that manufacturers would test their batteries at lower current to maximize stated life. Indeed, my (extremely cursory) analysis of marine batteries would indicate that these are usually tested at C20.
I stand corrected on the amp hour comment.
I mentioned this in my engine thread, but I got a solid data point on the earthx today, and thought it was worth adding here as well. On my 2 hour break-in flight, the field wire for the alternator broke about an hour in. Since I was already circling the airport with my gear down, I decided to continue flying until the voltage dropped below 12. When the alternator quit, I had 13V. After landing an hour later it was still at 12.7V. I did shut off my landing lights and second radio, but I let the autopilot continue flying.
you could simply do it mathematically. a log book entry is all that is needed but a full/corrected w&b chart would be more informative.
when is a website approved or acceptable data to the FAA?
You do see that the part that I circled said "later this year" and that my post was dated 2023 and that today is 2025, right?
We look forward to your business! Thanks for the consideration.
Is there any move towards making these available for Bonanzas?We look forward to your business! Thanks for the consideration.
Absolutely! In fact, by end of 2025 we should have almost all 1-4 seater aircraft, 12V and 24V charging systems, added to our Approved Model List (AML) STC's. We can only go as fast as the FAA on getting this done.
As we get them, we try to make posts such as this but you can also reach out to us directly to get put on the contact list for your particular aircraft. (I can not put our link or email here as it is "not allowed")
(Links are allowed once you have a few more posts- the intent is to encourage participation and discourage drive-bys.)
You have to have a certain number of posts before being able to post links (I think it's actually five). I think we know how to find you, thoughAbsolutely! In fact, by end of 2025 we should have almost all 1-4 seater aircraft, 12V and 24V charging systems, added to our Approved Model List (AML) STC's. We can only go as fast as the FAA on getting this done.
Hi George! There is a reason why few companies invest the time and resources to pursue the certified aviation market to bring new and improved innovations as the hill is most definitely steep and long with not only the FAA to deal with but then you have the "resistance to change" obstacles too!!!
The GA market is easily 10+ years behind in using innovative products that the experimental aircraft market has had full access too. For example, the latest STC's for the Cessna 172's and the Aviat Pitts has been an ongoing project that began back in early 2018 to get the approval in May of 2025. If our mission and passion was not based in the pursuit of bringing aircraft battery technology into the 21st century, we would have abandoned this a long time ago.
Hmm, including the Mudry CAP-10?Absolutely! In fact, by end of 2025 we should have almost all 1-4 seater aircraft, 12V and 24V charging systems, added to our Approved Model List (AML) STC's. We can only go as fast as the FAA on getting this done.
Sorry, I should have been more specific, we will have the ones we are pursuing, and it is based on how many aircraft are built to make the list. The Mudry CAP-10 is a awesome plane but only 300+ built. Based on this a field approval would be your best option for 2025 but we will put it on our potential list if we get more pilots interest in this plane.Hmm, including the Mudry CAP-10?
Hmm, including the Mudry CAP-10?
Most lithium battery installs are considered a major alteration with some rechargeable versions requiring an STC per existing guidance.
Pulling your chain a bit. Only 22 of them in US last time I looked.
